參數(shù)資料
型號: MC68LNC705C9ACFN
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 100/177頁
文件大?。?/td> 1941K
代理商: MC68LNC705C9ACFN
General Description
Software-Programmable Options (MC68HC05C9A Mode Only)
MC68HC705C9A — Rev. 4.0
Advance Information
MOTOROLA
General Description
29
1.6 Software-Programmable Options (MC68HC05C9A Mode Only)
The C9A option register (OR), shown in Figure 1-4, is enabled only if
configured in C9A mode. This register contains the programmable bits
for the following options:
Map two different areas of memory between RAM and EPROM,
one of 48 bytes and one of 128 bytes
Edge-triggered only or edge- and level-triggered external interrupt
(IRQ pin and any port B pin configured for interrupt)
This register must be written to by user software during operation of the
microcontroller.
RAM0 — Random Access Memory Control Bit 0
This read/write bit selects between RAM or EPROM in location $0020
to $004F. This bit can be read or written at any time.
1 = RAM selected
0 = EPROM selected
RAM1— Random Access Memory Control Bit 1
This read/write bit selects between RAM or EPROM in location $0100
to $017F. This bit can be read or written at any time.
1 = RAM selected
0 = EPROM selected
IRQ — Interrupt Request Bit
This bit selects between an edge-triggered only or edge- and level-
triggered external interrupt pin. This bit is set by reset, but can be
cleared by software. This bit can be written only once.
1 = Edge and level interrupt option selected
0 = Edge-only interrupt option selected
$3FDF
Bit 7
6
54321
Bit 0
Read:
RAM0
RAM1
IRQ
Write:
Reset:
00
000010
= Unimplemented
Figure 1-4. C9A Option Register
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